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wh1che n e e e i `Figure l, is laufend` view of a portion of a locomotive with my improvements attached.

Fig. f2 is an isometric view of the same, a. ,portion of the exterior being removed toI show the parts within.` Fig. 3 isa vertical w longitudinalsection; on the line of Figs. 1 and 5; Fig. 4:,a section upon the line B B of Fig. 3.; Fig.` 5, a section upon the line C C `of Fig. 3; Fig.` 6, avertical transverse sec` tion upon theline D Dof Fig. 3.

` In the construction of furnaces `for steam boilers various planshave been resorted to the rein the other.

c 1 lthelsmoke and gases from the freshfire in `one compartmell'llfand theheated air `from an `incandescenttfrefjin the other compartment, have beenthrowninto a vcombustion I -UNITEDSTATES PATENTOFFIGE- i lol w." BAYiiEx, on MANoHEsTE R1," HAMPSHIRE, ,AssIGNoR rro THE MANCHESTER `LoooMo'rrvE woRKs. l

rUaNAcEroR nocono'rrvns.

` e le jfspeeihatida oflLeftrs Patent No; 12,749, dated April 17, 1855.

Towwaoatrfmgeamm.' ,n I e e BAYILEY, of `Manchester, "in .the county of Hillsboro andf State of `New f Hampshire, have invented certain, new andusefuliImprovements in the Construction of the" Furnaces of Locomotive and other `Steam-Bloilers,` of which the fol-u `lowing `is affulhlclear, and exactdescription, reference being had to the .annexed drawings, making partfof this specification, in

for thepurpose lof economizing fuel and for the more perfecte` combustion ofthe gases and smoke. Among others, double furnaces have been employed,the compartments of which werealternately supplied with fuel, f and the smoke and gasesv from the one so supplied being permitted to pass up through that the operation of this furnace must be `very imperfect, as the fires can only receive one halfythe amount `of oxygen `due to the extent of grate surface employed,that which has once passed through the irstre being obliged to descend and `pass through the grate` of the second one. In other similarly I arranged `furnaces thesmoke from the fresh fire hasbeen thrown into the compartment air'arefbutimperfectly mixed, and the combustion `is stilldefective., `In other `furnaces chamberwhere theyfare mixedf and con- 1 sumedtogethene The performance of lthese furnaces has not been sosatisfactory as was anticipated, vowingto the fact, that the smoke and ases fromthe fresh fire were not sufricient y heated, "and not u so perfectly mixed It is evident however with those from the incandescent fire as to `.burn readily, after they have entered the combustion chamber. My invention has Vfor its object the removal of all kthese difficulties, and my furnacedifl'ers from those above referred .to in this, that the smoke and gasesfrom the fresh fire are caused to pass through theV whole length of the other compartment, and thus become highly heated, and thoroughly mixed with those from the incandescent fire; they then enter together a combustion chamber, where they receive an additional `supply ofair from a suitable opening, and are consumed immediately` behind the tube plate.

"Toenable othersskilled in the art to understand my invention I will proceed to describe the manner in which I have carried it out. e

The furnace is entirely surrounded by water space F, and is divided into two compartments F, F', by the mid feat-her or partition G, through the openingH in which, the two compartments communicate with each other. Immediately` over the furnace, and separated therefrom by the water space I, is the combustion chamber K, which communicates with the compartments below through the openings L, L.

M, M, are dampers which slide in the ways a, and areoperated by the rods b; by means of these dampers the openings L, L', are closed when necessary. In Fig. 2 the damper M and the ways a in which it slides, are removed.

N is an opening into the chamber K, through which air is admitted for the more perfect combustion of the unconsumed gases. This opening may be furnished with a door `R or other suitable damper or slide, by the partial opening of which the quantity of air admitted isregulated.

O, O', are the fire doors; P, the tube plate; Q, the tubes.

Operation The res 4being started, the fuel in one of the compartments is allowed to become incandescent ;the damper M is then opened and M is closed g-fresh fuel is then thrown upon the fire in the compartment F', the unconsumed gases and smoke from which pass thro-ugh the opening H, kover the whole length of the incandescent fre in the compartment F, through the opening L into the combustioncham- ,ber `K g-thesef gases thus become highly heated and intimately mixed .with those rising from the incandescent fire, and on reaching the combustion chamber they receive a sutlicient supply of air through the opening N, to thoroughly consume them this takes place immediately in front of the tube plate P. Vhen the compartment F has ceased to throw olf smoke, its damper M, is opened and M, is closed,-f1esh fuel is thrown into the compartment F, the smoke from which passes through the opening H, over the fire in F, and through the opening L, into the combustion chamber as before. Fresh fuel is thus added alter-V nately to each compartment of the furnace as the fire in the other becomes incandescent, the dampers being changed as required each time the furnace is fed.

Instead of dividing the furnace into two compartments, a rotating furnace having two or more re boxes may be employed, each one of which as it revolves receives a fresh feed on arrival at a certain point; the smoke and gases being allowed to pass over the surface of the fire, in all the other chainbers, and to issue into a combustion chain-,

ber arranged as above; such revolving furnace however forms no part of my present invention and need not be further described.

The above described arrangement and combination of duplicate re boXes and combustion chamber, is particularly applicable to boilers of locomotives, but may also be applied to boilers .of stationary engines. I do not therefore limit myself in its use to locomotive boilers alone, but intend to apply it Whenever it may be found useful.

What I claim as my invention and desire to secure by Letters Patent is* The within described arrangement of the p 

